package com.zzyl.framework.config;

import org.springframework.cache.annotation.CachingConfigurerSupport;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;
import org.springframework.data.redis.serializer.StringRedisSerializer;

/**
 * redis配置
 * @author ruoyi
 */
@Configuration
@EnableCaching
public class RedisConfig extends CachingConfigurerSupport {
    @Bean
    @SuppressWarnings(value = {"unchecked","rawtypes"})
    public RedisTemplate<Object, Object> redisTemplate(RedisConnectionFactory connectionFactory) {
        RedisTemplate<Object, Object> template=new RedisTemplate<>();
        template.setConnectionFactory(connectionFactory);
        
        FastJson2JsonRedisSerializer serializer=new FastJson2JsonRedisSerializer(Object.class);
        
        // 来序列化redis的key和value
        template.setKeySerializer(new StringRedisSerializer());
        template.setValueSerializer(serializer);
        
        // Hash的key也采用StringRedisSerializer的序列化方式
        template.setHashKeySerializer(new StringRedisSerializer());
        template.setHashValueSerializer(serializer);
        
        template.afterPropertiesSet();
        return template;
    }
    
    @Bean
    public DefaultRedisScript<Long> limitScript() {
        DefaultRedisScript<Long> redisScript=new DefaultRedisScript<>();
        redisScript.setScriptText(limitScriptText());
        redisScript.setResultType(Long.class);
        return redisScript;
    }
    
    /**
     * 限流脚本
     */
    private String limitScriptText() {
        return "local key = KEYS[1]\n" + "local count = tonumber(ARGV[1])\n" + "local time = tonumber(ARGV[2])\n" + "local current = redis.call('get', key);\n" + "if current and tonumber(current) > count then\n" + "    return tonumber(current);\n" + "end\n" + "current = redis.call('incr', key)\n" + "if tonumber(current) == 1 then\n" + "    redis.call('expire', key, time)\n" + "end\n" + "return tonumber(current);";
    }
}
